The panning tool allows you to scroll the map in any direction, but does not change the magnification level.
After selecting the panning tool, press (but don't release) the left mouse button over the map. While the button is down, the map will scroll in the direction of your cursor movements. To stop panning, release the mouse button. If you move the mouse with a small motion, the map will pan slowly; large motions make the map pan faster.
While panning, the new areas that come into view are usually displayed as they would normally appear. For very complex maps, you can enable an option for draft displaying that can significantly speed up panning.